WO2020224820A1

WO2020224820A1 - Unwinding station

Info

Publication number: WO2020224820A1
Application number: PCT/EP2020/054415
Authority: WO
Inventors: Matthias Wohlfahrt; Andreas Eberle; Martin Maier; Herbert Illenberger; Nico Wirth; Frank Schmidt; Ewald Wetschenbacher
Original assignee: Voith Patent Gmbh
Priority date: 2019-05-03
Filing date: 2020-02-20
Publication date: 2020-11-12
Also published as: EP3962848B1; DE102019111470A1; DE102019111470B4; EP3962848C0; CN113795445A; EP3962848A1; CN113795445B

Abstract

The invention relates to a device for unwinding a material web (1), in particular a paper or card web, from a winding roll (2, 3) for a downstream machine for processing the material web (1), having a primary unwinding device (5), a secondary unwinding device (6) and an adhesive and separating device (7), wherein the primary unwinding device (5) and the secondary unwinding device (6) each have two running surfaces (11, 12) running in parallel with each other and coming into contact with corresponding counter surfaces of the rotatable outer rings (10) of the axle journal bearings (15) for moving the winding roll (2, 3) from the primary unwinding device (5) to the secondary unwinding device (6). The intention is to reduce the design complexity by the axial location of the running surfaces (12) of the primary (5) and the secondary unwinding device (6) being adjustable and the respective running surfaces (12) of the primary unwinding device (5) and the secondary unwinding device (6) being directly adjacent to one another.

Description

Unwinding station

The invention relates to a device for unwinding a web of material, in particular a paper or cardboard web, from a winding roll for a subsequent machine unit for processing the web of material, the journals of which are mounted in journal bearings with a rotatable outer ring, with a primary unwinding device, a secondary unwinding device and a gluing and separating device, the primary and the secondary unwinding device for moving the winding roll from the primary to the secondary unwinding device each having two running surfaces running parallel to one another and coming into contact with corresponding mating surfaces of the rotatable outer rings of the journal bearings.

Unwind stations of the type discussed here are known. They serve for the continuous unwinding of a material web from a winding roll and are arranged upstream of a machine for processing the material web, for example a coating machine or a calender.

A known unwinding station comprises a primary and a secondary unwinding device, which serve to guide a winding roll. A full winding roll is first guided by the primary unwinding device while the material web is being unwound. When the winding roll has a desired diameter, it is transferred from the primary to the secondary unwinding device.

A new, full winding roll is then fed to the primary unwinding device and the web of material wound on it is connected to the unwinding roll of material guided by the secondary unwinding device before it is completely unwound. For this purpose, a gluing device is provided, which often has a swiveling gluing roller about an axis via which the material web running from the secondary unwinding device is guided to the following material web processing machine - seen in the direction of travel of the material web. To connect the two webs of material to one another, the adhesive roller is pivoted and pressed against the winding roller guided by the primary unwinding device. At the same time, the Secondary unwinding device guided winding roll cut off the running material web by means of a cutting device.

In another device known from EP 1 798 172 for unwinding a web of material, after unwinding it is cut in the longitudinal direction by one or more cutting devices and divided into individual webs, in order then to be wound onto winding tubes to form so-called shipping rolls.

For this purpose, for example, backup roll or carrier roll winding machines are used. Carrier roller winding machines have two driven carrier rollers on which the winding rollers lie next to one another with aligned sleeves during winding. The support roller winding machines have a roll ejection device which, when a roll is changed, ejects a set of fully wound winding rolls from the roll bed formed by the two support rollers. The finished set of winding rolls is pressed by the ejector device over the top of a support roller onto a lowering platform.

For the transport from the primary to the secondary unwinding station, swivel arms are used, for example, which can be pivoted about an axis and engage on both sides of the winding roll and transfer it to the secondary unwinding device by means of a swivel movement.

Since the winding rolls can differ from one another, albeit slightly, with regard to the axial position of the wound web of material, considerable problems sometimes arise. The object of the invention is therefore to reduce the effort for unwinding the material web.

According to the invention, the object was achieved in that the axial position of the running surfaces of the primary and secondary unwinding device is adjustable and the respective running surfaces of the primary and secondary unwinding device are directly adjacent to one another. The elimination of a transport device between the primary and secondary unwinding device simplifies the design considerably.

Experience has shown that the axial position of the outer rings, which are designed as cylindrical sleeves, of the journals of two winding rollers can deviate from one another by up to 75 mm or more.

The exact, axially adjusted continuation of the unwound material web is ensured by the axial adjustability of the position of the bearing of the primary and the secondary unwinding device.

The transport of the winding roll is simplified if the running surfaces of the primary and secondary unwinding devices run horizontally or are slightly inclined in the transport direction.

The horizontal movement of the winding roll on the running surfaces is mostly supported by linear slides.

The running surfaces of the primary and secondary unwinding devices and the corresponding mating surfaces of the rotatable outer rings of the journal bearings should have a shape that axially guides the respective outer ring.

For easy guidance from the primary unwind station to the secondary unwind station, it is advantageous if the outer rings of the journal bearings of the winding roll in the primary and secondary unwinding devices are each guided on two parallel running rails.

To ensure the axial guidance of the winding roll while it is moving on the rails, the outer rings of the journal bearings of the winding roll should each have a complementary circumferential groove into which the corresponding rail of the primary and secondary unwinding device protrudes.

Alternatively, it is also advantageous if the outer rings of the journal bearings each have a circumferential ring which is inserted into a complementary groove of the corresponding running surface of the primary and / or the secondary unrolling device protrudes.

The invention is to be explained in more detail below on the basis of several exemplary embodiments. In the attached drawing show:

Figures 1 to 5: each schematic side views of a device for

Unwinding a winding roll 2, 3 of a material web 1 in different stages of the unwinding process;

Figure 6: one side of the unwinding device

Figure 7: the outer ring 10 to be guided of the journal bearing 15 of the

Winding roll 2,3 according to Figure 6 and

Figure 8: Another possibility for the axial guidance of the outer rings

10 of the journal bearings 15 in the primary 5 and the secondary unwinding device 6.

In a device with two unwinding devices 5, 6 for unwinding winding rolls 2, 3, a material web 1 is unwound from the full winding roll 2 in the primary unwinding device 5 by a first drive during the unwinding process according to FIG.

Simultaneously with the still full winding roll 2 (full reel, “mother roll”), the winding roll 3, which has essentially already been unwound, is unwound in the secondary unwinding device 6 by a second drive up to the end of a material web 1.

The power of the second drive is such that its drive motor is just sufficient to generate a small torque to enable the remaining unwinding of the material web 1 from the winding roll 3 in the secondary unwinding device 6.

In contrast to the second drive, the first drive is dimensioned so that its torque is sufficient to remove the material web 1 from the still full one Winding roll 2, which can have a diameter of, for example, 3500 mm and above, unwind.

The drives can be stationary or movable. The unwound material web 1 can be deflected over one or more guide rollers 9 to stabilize the web run.

In a further step shown in Figure 2, shortly before the material web 1 is unwound from the winding roll 3, this is separated by an adhesive and separating device 7 in order to one end of the material web 1 with a beginning of the material web 1 of the full winding roll 2 connect. As a result, the winding roll 3 is now ready to be lifted out of the secondary unwinding device 6, as can be seen in FIG. The winding roll 2 is then moved into the secondary unwinding device 6 according to FIG. Then this winding roll 2 is unwound to the end in the secondary unwinding device 6 in which the winding roll 3 was originally located.

Meanwhile, as shown in FIG. 5, a new winding roll 4 is brought into the primary unwinding device 5 in which the winding roll 2 was previously located. The same unwinding processes then take place as shown above.

The web tension is regulated during the entire process, which counteracts winding errors.

In addition to the known unwinding process described above, additional unwinding processes can of course be implemented with the device. Such a supplementary unwinding process occurs, for example, when the system is to be restarted after a lengthy maintenance shutdown.

After the unwinding device, the material web 1 is divided into several individual webs of adjustable width by means of a known one, not shown Cutting section. These individual webs are then wound up on the set of tubes lying in a winding bed to form shipping rolls.

During the unwinding of the material web 1, the winding roll 2, 3 is axially fixed in a fixed mounting of the primary 5 or the secondary unwinding device 6. This prevents the material web 1 from running axially during the unwinding and thus also during the cutting of the web and the rewinding of the partial webs.

This storage is achieved according to Figures 6 to 8 in that the rotatable outer rings 10 of the journal bearings 15 of the winding roll 2, 3 in the primary 5 and the secondary unwinding device 6 on two parallel and horizontally extending running surfaces 12 in the form of Running rails are guided.

To minimize the effort, the respective running surfaces 12 of the primary 5 and the secondary roller device 6 border directly, i.e. without the interposition of another unit, to each other. For a smooth transfer of the winding roll 2, 3 regardless of its position, it is important that the axial position of the running surfaces 12 of the primary 5 and secondary unwinding device 6 is adjustable.

For the axial guidance of the winding roll 2, 3 the outer rings 10 of the journal bearings 15 of the winding roll 2, 3 according to FIG. 7 each have a circumferential groove 13 complementary to the running rails, into which the corresponding running rail of the primary 5 or secondary unwinding device 6 intervenes.

In order to prevent the axle journals 14 from moving along the running rail, particularly during unwinding, the journal journals 14 or the journal bearing 15 are each in a receiving fork or the like. stored.

Since the position and width of the wound material web 1 can differ slightly from winding roll 2,3 to winding roll 2,3, the axial position of the bearing, in particular each running rail of both unwinding devices 5,6, is to adapt to the conditions of the respective winding roll 2,3 axially adjustable separately.

So the outer rings 10 of the journal bearings 15 within the Unwinding devices 5, 6 slide or preferably roll on the running rails 12, which significantly simplifies the transfer of the winding roll 2 from the primary unwinding device 5 to the secondary unwinding device 6. In a reversal of the embodiment described so far, the outer rings 10 of the journal bearings 15 each have a circumferential ring 8 in FIG.

Claims

1. Device for unwinding a material web (1), in particular paper or cardboard web from a winding roll (2,3) for a subsequent machine unit for processing the material web (1), the journal (14) of which in journal bearings (15) with rotatable Outer ring (10) are mounted, with a primary roll-off device (5), a secondary roll-off device (6) and a gluing and separating device (7), the primary (5) and the secondary roll-off device (6) for the Moving the winding roll (2,3) from the primary (5) to the secondary unwinding device (6) two parallel to each other and with corresponding mating surfaces of the rotatable outer rings (10) of the journal bearings (15) of the winding roll (2,3 ) have running surfaces (11, 12) coming into contact, characterized in that the axial position of the running surfaces (12) of the primary (5) and the secondary roller device (6) is adjustable and the respective running surfaces (12) of the primary (5) and the secondary unwinding device (6) are directly adjacent to one another.

2. Device according to claim 1, characterized in that the running surfaces (12) of the primary (5) and the secondary roll-off device (6) and the corresponding mating surfaces of the outer rings (10) of the journal bearings (15) a respective outer ring (10) have axially leading shape.

3. Device according to claim 1 or 2, characterized in that the running surfaces (11, 12) of the primary (5) and the secondary unwinding device (6) extend at least substantially horizontally.

4. Device according to one of the preceding claims, characterized in that the running surfaces (12) of the primary (5) and / or the secondary roll-off device (6) are designed as running rails.

5. The device according to claim 4, characterized in that the running rails protrude into a complementary circumferential groove (13) of the corresponding outer ring (10) of the journal bearing (15).

6. Device according to one of claims 1 to 4, characterized in that the outer rings (10) of the journal bearings (15) each have a circumferential ring (8) which is in a complementary groove (11) of the corresponding running surface (12) Primary (5) and / or the secondary unwinding device (6) protrudes.